package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.mapper.OrdersMapper;
import com.itheima.reggie.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
public class OrdersServiceImpl extends ServiceImpl<OrdersMapper, Orders> implements OrdersService {

    @Autowired
    private ShoppingCartService shoppingCartService;
    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     *
     * @param orders
     */
    public void submit(Orders orders) {
//        1. 获得当前用户id, 查询当前用户的购物车数据
        Long userId = BaseContext.getCurrentId();
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId, userId);
        List<ShoppingCart> list = shoppingCartService.list(lqw);
        if (list == null || list.size() == 0) {
            throw new CustomException("购物车为空，不能下单");
        }

//        2. 根据当前登录用户id, 查询用户数据
        User user = userService.getById(userId);

//        3. 根据地址ID, 查询地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if (addressBook == null) {
            throw new CustomException("用户地址信息有误，无法下单");
        }

        long orderId = IdWorker.getId();//订单号
        //计算总金额
        AtomicInteger amout = new AtomicInteger(0);


        //        4. 组装订单明细数据, 批量保存订单明细
        List<OrderDetail> orderDetailList = list.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setNumber(item.getNumber());
            orderDetail.setAmount(item.getAmount());
            amout.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        // 5. 组装订单数据, 批量保存订单数据
        orders.setId(orderId);
        orders.setNumber(String.valueOf(orderId));
        orders.setStatus(2);
        orders.setUserId(userId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setAmount(new BigDecimal(amout.get()));//总金额
        orders.setUserName(user.getName());
        orders.setPhone(user.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setAddress((addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        this.save(orders);

        orderDetailService.saveBatch(orderDetailList);
//        6. 删除当前用户的购物车列表数据
        shoppingCartService.remove(lqw);

    }
}
